US Patent 11712580 Body part fixation device with pitch and/or roll adjustment

A structure includes a base comprising a first ramp and an opposing, second ramp. The structure further includes a shell frame having an inner surface configured to a shape of a body part and an outer convex surface, wherein the outer convex surface of the shell frame rides upon, and moves relative to, upper surfaces of the first ramp and the second ramp to enable a pitch of the shell frame to be adjusted relative to the base.